Hello,

Thank you for contacting us!

You cannot directly change the display text of the group key.

A workaround for this can be , setting mapped data, where the grouping keys text is changed.

You can use the dataBound event, where you can swap the original data with the mapped.I made a sample, based on your requirement.

Please, take a look at the sample and let me know if you have any questions.

igComboGrouping.zip